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BlackZzzverrR [31]
3 years ago
5

Why is the earth often referred to as the blue planet

Chemistry
2 answers:
Vilka [71]3 years ago
7 0

Most of the surface of the earth is covered with water and looks blue from space.

adoni [48]3 years ago
3 0
Since most of the planet is covered with water thats why it is referred to the blue planet
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You are presented with a mixture of iron beads and iron filings. how can you separate them? use a magnet dissolve the filings in
Svetllana [295]
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3 years ago
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How are chemicals used in gasoline?
timofeeve [1]

Answer:A typical gasoline mixture contains about 150 different hydrocarbons, including butane, pentane, isopentane and the BTEX compounds (benzene, ethylbenzene, toluene, and xylenes). Gasoline also contains chemicals such as lubricants, anti-rust agents and anti-icing agents that are added to improve car performance.

5 0
3 years ago
The base protonation constant Kb of allantoin (C4H4N3O3NH2) is ×9.1210−6. Calculate the pH of a 1.1M solution of allantoin at 25
larisa [96]

Answer:

pH= 11.5

Explanation:

To the calculation of the <u>pH value</u>, we need to write the ionization equation first. Then using the <u>ICE table</u> and the information given by the problem we can set up the problem:

C_4H_4N_3O_3NH_2~+~H_2O->C_4H_4N_3O_3NH_3^+~+~OH^-

I                  1.1 M                                                Zero                             Zero              

C                   -X                                                   +X                                 +X

E                  1.1-X                                                   X                                   X

As next step, using the <u>equilibrium expression</u> for Kb we can replace the terms find in the ICE table and then <u>solve for X</u>, so:

Kb=\frac{[C_4H_4N_2O_3NH_3^+][OH^-]}{[C_4H_4N_3O_3NH_2]}

9.2x10^-^6=\frac{[X][X]}{[1.1-X]}

9.2x10^-^6=\frac{X^2}{1.1-X}

(9.2x10^-^6)*[1.1-X]=X^2

1.01x10^-^5~-9.2x10^-^6X-X^2=0

X=0.003173

With the value of X we can find the <u>pOH</u> (lets remember that X<u> is the concentration of OH-</u>), so:

pOH=-Log(0.003173)

pOH=2.50

Finally, we can find the <u>pH value</u> with the equation:

14~=~pH~+~pOH

14~=~2.5~+~pOH

pH=14-2.5

pH=11.5

<u>The 1.1 M allantoin solution have a pH value of 11.5</u>

4 0
3 years ago
Answer #2 for 10 points!
-BARSIC- [3]

a. i,ii,vi

b.iv,v,iii

3 0
4 years ago
If a thimble holds 5 mi of water, how many liters can it hold
Mashcka [7]
0.005 is the correct answer i hope this helps man :)
8 0
3 years ago
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